Sounds like an oil pressure problem. If you had one tappet to start rattling, I'd suspect a roller on a tappet was going bad. But you said "tappets", plural. If all your tappets were rattling badly, you lost oil pressure for some reason. This is the only thing that I can think of that will do that.

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Check the High pressure fuel pump tappet by removing the high pressure fuel pump and pulling out the tappet/cam follower these have a tendency to wear out prematurely also where that tappet rides on the cam it wear out the cam lobe as well. the 2.0T has been there worst engine to date (in my humble opinion) unfortunately.

Engine rattle could be all sorts of things from hydraulic tappet, they should clear within seconds, Piston Slap, that will get quieter as the engine gets hot, to little end bearings or worn rings.Personally I would expect a substantial discount if I were to purchase it. But having said all that, if the oil is dirty and old, an oil change may cure it.Your gamble!

I don't know too much about the oil pumps in the Twin Cam engines. I have never worked with one of them but I've got extensive experience with the older type pump used on the Shovelheads and Evolution engines.

A Harley engine employs a high volume low pressure oiling system. The old Shovelheads would actually show no oil pressure when idling hot with most gauges. The oil pressure switch would cut the light off at four pounds of oil pressure. A Harley engine will not hold a lot of oil pressure because the engine is built using roller bearings instead of shell bearings.

As long as the tappets are not rattling, you don't have a problem with oil pressure. If your oil pressure drops too low, the tappets are hydraulic and they will rattle like hell. There will be no doubt in your mind as to the problem.

Now, back to your question as to why the oil pressure on your bike drops when accelerating under a load, I have no idea.

hi this could be due to your hydraulic tappets, these will start to rattle if the oil has been low at some stage and the oil was to thin this normally sounds worse in the mornings on first start and gets quieter as the day goes on or disappearsaltogether, what you could do, is use an engine flush, put it in the engine and run it for a period of time, then empty the oil and refill with a thicker grade oil and see how that goes..hope this helps